content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * --------------------
   * HMSNumberFormat.java
   * --------------------
   * (C) Copyright 2013, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes:
   * --------
   * 28-Sep-2013 : Version 1 (RW);
   *
   */
  
  package org.jfree.chart.util;
  
  import java.text.DecimalFormat;
  import java.text.FieldPosition;
  import java.text.NumberFormat;
  import java.text.ParsePosition;
  
  /**
   * A custom number formatter that formats numbers (in seconds) as HH:MM:SS.
   * Created in response to:
   * 
   * http://stackoverflow.com/questions/19028908/jfreechart-need-to-customize-y-axis-just-for-printing
   * 
   * @since 1.0.17
   */
  public class HMSNumberFormat extends NumberFormat {
  
      private NumberFormat formatter = new DecimalFormat("00");
      
      /**
       * Creates a new instance.
       */
      public HMSNumberFormat() {
          // nothing to do
      }
  
      /**
       * Formats the specified number as a string of the form HH:MM:SS.  The 
       * decimal fraction is ignored.
       *
       * @param number  the number to format.
       * @param toAppendTo  the buffer to append to (ignored here).
       * @param pos  the field position (ignored here).
       *
       * @return The string buffer.
       */
      @Override
      public StringBuffer format(double number, StringBuffer toAppendTo,
              FieldPosition pos) {
          return format((long) number, toAppendTo, pos);
      }
  
      /**
       * Formats the specified number as a string of the form HH:MM:SS.
       *
       * @param number  the number to format.
       * @param toAppendTo  the buffer to append to (ignored here).
       * @param pos  the field position (ignored here).
       *
       * @return The string buffer.
       */
      @Override
      public StringBuffer format(long number, StringBuffer toAppendTo,
              FieldPosition pos) {
          StringBuffer sb = new StringBuffer();
          long hours = number / 3600;
          sb.append(this.formatter.format(hours)).append(":");
          long remaining = number - (hours * 3600);
          long minutes = remaining / 60;
          sb.append(this.formatter.format(minutes)).append(":");
          long seconds = remaining - (minutes * 60);
          sb.append(this.formatter.format(seconds));
          return sb;
      }
  
      /**
       * Parsing is not implemented, so this method always returns
       * <code>null</code>.
       *
       * @param source  ignored.
       * @param parsePosition  ignored.
       *
       * @return Always <code>null</code>.
       */
      @Override
      public Number parse (String source, ParsePosition parsePosition) {
          return null; // don't bother with parsing
      }
  
  }
  